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net: lwm2m: fix periodic services handling

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This fixes an issue where if timestamp == service_due_timestamp,
we don't call the periodic service.  Then the following call to
engine_next_service_timeout_ms() returns 0 because the service
is still due and lwm2m_engine_service() is called again.
This process repeats several times until the value of
k_uptime_get() changes and then the work is finally handled.

Previously, the resolution of k_uptime_get() was in ms.  A recent
change to this API defaults Zephyr so that the resolution is
set via CONFIG_SYS_CLOCK_TICKS_PER_SEC (default 100).

This means the value of k_uptime_get() only changes every 10ms.

Reported-by: Github User pieterjanc
Signed-off-by: Michael Scott <mike@foundries.io>
This commit is contained in:
Michael Scott 2019-04-08 11:31:46 -07:00 • committed by Anas Nashif
commit cb2bfcb9c0
1 changed files with 1 additions and 1 deletions
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subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -3804,7 +3804,7 @@ static int lwm2m_engine_service(void)
service_due_timestamp = srv->last_timestamp +
K_MSEC(srv->min_call_period);
/* service is due */
if (timestamp > service_due_timestamp) {
if (timestamp >= service_due_timestamp) {
srv->last_timestamp = k_uptime_get();
srv->service_work(NULL);
}